DE69700319T2 - Magnet arrangement for imaging magnetic resonance with opposing permanent magnets - Google Patents

Magnet arrangement for imaging magnetic resonance with opposing permanent magnets

Info

Publication number
DE69700319T2
DE69700319T2 DE69700319T DE69700319T DE69700319T2 DE 69700319 T2 DE69700319 T2 DE 69700319T2 DE 69700319 T DE69700319 T DE 69700319T DE 69700319 T DE69700319 T DE 69700319T DE 69700319 T2 DE69700319 T2 DE 69700319T2
Authority
DE
Germany
Prior art keywords
magnetic resonance
permanent magnets
magnet arrangement
imaging magnetic
opposing permanent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
DE69700319T
Other languages
German (de)
Other versions
DE69700319D1 (en
Inventor
Ken Ohashi
Yuhito Yoneda
Koji Miyata
Dai Higuchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shin Etsu Chemical Co Ltd
Original Assignee
Shin Etsu Chemical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shin Etsu Chemical Co Ltd filed Critical Shin Etsu Chemical Co Ltd
Application granted granted Critical
Publication of DE69700319D1 publication Critical patent/DE69700319D1/en
Publication of DE69700319T2 publication Critical patent/DE69700319T2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
    • G01R33/383—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using permanent magnets
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
    • G01R33/387—Compensation of inhomogeneities
    • G01R33/3873—Compensation of inhomogeneities using ferromagnetic bodies ; Passive shimming

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
DE69700319T 1996-04-12 1997-04-09 Magnet arrangement for imaging magnetic resonance with opposing permanent magnets Expired - Lifetime DE69700319T2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8091049A JP3014319B2 (en) 1996-04-12 1996-04-12 Magnet facing permanent magnet circuit

Publications (2)

Publication Number Publication Date
DE69700319D1 DE69700319D1 (en) 1999-08-19
DE69700319T2 true DE69700319T2 (en) 1999-11-04

Family

ID=14015658

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69700319T Expired - Lifetime DE69700319T2 (en) 1996-04-12 1997-04-09 Magnet arrangement for imaging magnetic resonance with opposing permanent magnets

Country Status (4)

Country Link
US (1) US5825187A (en)
EP (1) EP0801314B1 (en)
JP (1) JP3014319B2 (en)
DE (1) DE69700319T2 (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100373577B1 (en) * 1997-12-26 2003-02-26 스미토모 도큐슈 긴조쿠 가부시키가이샤 Mri magnetic field generator
GB2355800B (en) * 1999-10-29 2004-10-27 Oxford Magnet Tech Improved magnet
JP3705995B2 (en) * 2000-04-19 2005-10-12 ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー Gradient coil manufacturing method, gradient coil, and magnetic resonance imaging apparatus
WO2002071942A1 (en) * 2001-03-14 2002-09-19 Hitachi Medical Corporation Magnetic resonance imaging apparatus and static magnetic field generating apparatus used therefor
US6518867B2 (en) 2001-04-03 2003-02-11 General Electric Company Permanent magnet assembly and method of making thereof
US6662434B2 (en) 2001-04-03 2003-12-16 General Electric Company Method and apparatus for magnetizing a permanent magnet
DE10219091A1 (en) * 2002-04-29 2003-11-20 Siemens Ag Rotational movement detector comprises a hollow cylindrical induction element inside which are arranged an Eddy current excitation arrangement and an Eddy current sensor arrangement
US7148689B2 (en) 2003-09-29 2006-12-12 General Electric Company Permanent magnet assembly with movable permanent body for main magnetic field adjustable
US7423431B2 (en) * 2003-09-29 2008-09-09 General Electric Company Multiple ring polefaceless permanent magnet and method of making
CA2884097C (en) 2014-03-13 2020-04-21 LT Imaging Inc. Magnetic resonance imaging (mri) system and method
US10945631B2 (en) 2019-07-18 2021-03-16 Sigwa Company, Llc Magnet assembly for magnetic resonance imaging (MRI) scanning system
EP4073531A1 (en) * 2019-12-10 2022-10-19 Hyperfine Operations, Inc. Ferromagnetic frame for magnetic resonance imaging

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8402360D0 (en) * 1984-01-30 1984-02-29 Picker Int Ltd Nmr shims
JPH0280033A (en) * 1988-09-16 1990-03-20 Toshiba Corp Permanent magnet type magnetic resonance imaging device
US5061897A (en) * 1990-03-23 1991-10-29 Fonar Corporation Eddy current control in magnetic resonance imaging
US5414399A (en) * 1991-12-19 1995-05-09 Applied Superconetics, Inc. Open access superconducting MRI magnet having an apparatus for reducing magnetic hysteresis in superconducting MRI systems
US5495171A (en) * 1993-01-19 1996-02-27 Fonar Corporation Eddy current control in NMR imaging systems
EP0616230B1 (en) * 1993-03-15 1998-08-05 Siemens Aktiengesellschaft Homogeneous field magnet with pole plate spaced by correction air-gap for each pole shoe
FI105293B (en) * 1993-06-08 2000-07-14 Picker Nordstar Oy Polar shoe for magnetic resonance imaging
JPH0831635A (en) * 1994-07-08 1996-02-02 Sumitomo Special Metals Co Ltd Mri magnetic field generating device

Also Published As

Publication number Publication date
EP0801314B1 (en) 1999-07-14
JP3014319B2 (en) 2000-02-28
JPH09283327A (en) 1997-10-31
EP0801314A1 (en) 1997-10-15
DE69700319D1 (en) 1999-08-19
US5825187A (en) 1998-10-20

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition